swift - 从当前位置到注释的距离。 (火力基地)

Question

我想要知道从我的当前位置到 FireData Base 中的注释的距离。我试图用文字表达出来，但我不能;(。我想在变量中得到两个位置之间的距离。我希望你们能帮助我。

func reload(){
    //get data
    Database.database().reference().child("Rollerbanken").observe(.value, with: { (snapshot) in



        for item in snapshot.children{

            if let value = snapshot.value as? Dictionary<String, Any> {

                for key in value.keys {
                    if let itemDict = value[key] as? Dictionary<String, AnyObject> {

                        let annotation = MKPointAnnotation()
                        annotation.title = itemDict["TypeControle"] as! String
                        let tijd = itemDict["Tijd"] as! String
                        annotation.subtitle = "Geplaatst om \(tijd)"

                        let getLatitude = itemDict["Latitude"] as? String
                        let getLongitude = itemDict["Longitude"] as? String
                        if let lat = getLatitude, let long = getLongitude {
                            annotation.coordinate = CLLocationCoordinate2D(latitude: Double(lat)!, longitude: Double(long)!)

                            self.map.addAnnotation(annotation)

                            let directionRequest = MKDirectionsRequest()
                            directionRequest.source = MKMapItem.forCurrentLocation()
                            if #available(iOS 10.0, *) {
                                directionRequest.destination = MKMapItem(placemark: MKPlacemark.init(coordinate: CLLocationCoordinate2DMake(Double(lat)!, Double(long)!)))
                            } else {
                                // Fallback on earlier versions
                            }
                            directionRequest.transportType = .walking
                            let direction = MKDirections(request: directionRequest)
                            direction.calculate(completionHandler: { (response, error) in
                                if error != nil {
                                    print("Error while build route")
                                } else {
                                    let route = response?.routes.last
                                    let distance = route?.distance
                                    print(distance)
                                }
                            })
                        }
                    }
                }
            }
        }
    })
}

这是我的结构:

Answer 1

尝试使用此代码。不要忘记在 map 上启用您的当前位置

let directionRequest = MKDirectionsRequest()
        directionRequest.source = MKMapItem.forCurrentLocation()
        directionRequest.destination = MKMapItem(placemark: MKPlacemark.init(coordinate: CLLocationCoordinate2DMake(YOURPOINTLATITUDE, YOURPOINTLONGITUDE)))
        directionRequest.transportType = .walking
        let direction = MKDirections(request: directionRequest)
        direction.calculate(completionHandler: { (response, error) in
            if error != nil {
                print("Error while build route")
            } else {
                let route = response?.routes.last
                let distance = route?.distance